diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c64339e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+#ignore out files
+*out
+*.csv
+*.txt
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..835b31d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "semester2/challenge2-bus"]
+	path = semester2/challenge2-bus
+	url = git@github.com:JuanCldCmt/BUS-Homework.git
diff --git a/semester2/challenge1/main.c b/semester2/challenge1-moviedb/main.c
similarity index 100%
rename from semester2/challenge1/main.c
rename to semester2/challenge1-moviedb/main.c
diff --git a/semester2/challenge2-bus b/semester2/challenge2-bus
new file mode 160000
index 0000000..b21a3cc
--- /dev/null
+++ b/semester2/challenge2-bus
@@ -0,0 +1 @@
+Subproject commit b21a3ccd4e422cf188892e243372c92b2b11df1f